Define following term: (i) Precision (ii) Drift (iii) Static error (iv) Dead zone
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(i) Precision: It is the measure of consistency or repeatability of measurements. 

 OR

The closeness with which the individual measurements are departed or distributed about the average of number of measured value. 

(ii) Drift: Drift means that with a given input the measured values changes with time. Perfect reproducibility means that the instrument has no drift.

(iii) Static Error: Static error is defined as the difference between the measured value and the true value of the quantity.

(iv) Dead Zone: Dead zone is the largest range of value of measured variable to which instrument does not respond. It is mainly due to friction in the instrument.

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